In the midst of the Covid-19 pandemic, scientists and public health institutions made bold claims about the effectiveness of various policy responses such as closing schools and banning public gatherings. These claims shaped government responses and had enormous effects on the lives of billions of people around the world. Are those claims supported by data?
To answer that question, we explored whether patterns in the epidemiologic data could support claims made in the scientific literature and by public health institutions about the effectiveness of policy responses to Covid-19.